Will Ferrell has admitted that being approached by fans makes him uncomfortable.

The Campaign actor told USA Today that he is constantly at a loss for words when speaking with fans.

"I know I am continually letting people down when they come up to me. They approach me with the sense of, 'He's going to do something funny'. I don't feel any pressure to have to do it," Ferrell revealed.

He further explained: "Sometimes you're in a mood to be playful. Other times you have to be somewhere or you have your family. I have no problem with going, in a polite way, 'I have to go'.

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"When someone yells out a line from a movie I've done, a lot of times I can't remember what the line is."